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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Water does not just get into the heads, this would mean that the engine either sat long term stored and condensation got in the heads (can be normal) or you're getting water ingestion which needs to be diagnosed. On top of this the carb should have the bowls removed to check for debris and clean and rebuild as needed, it's very likely it could have got dirt in it. Timing should be checked, fuel under load, check for misfires, going through standard diagnosis such as ignition and fuel related considering the problem only being under load.
Thank you!- Joe
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